linux-kernel - Re: [PATCH v2 2/4] gpio: visoconti: Add Toshiba Visconti GPIO support

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Date:   Tue, 1 Dec 2020 14:02:04 +0900
From:   Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Punit Agrawal <punit1.agrawal@...hiba.co.jp>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>, yuji2.ishikawa@...hiba.co.jp,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 2/4] gpio: visoconti: Add Toshiba Visconti GPIO support

Hi,

Thanks for your review.

On Tue, Nov 17, 2020 at 09:59:06PM +0100, Linus Walleij wrote:
> Hi Nobuhiro,
> 
> On Thu, Nov 12, 2020 at 12:42 AM Nobuhiro Iwamatsu
> <nobuhiro1.iwamatsu@...hiba.co.jp> wrote:
> 
> > Add the GPIO driver for Toshiba Visconti ARM SoCs.
> >
> > Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
> 
> I just noticed this:
> 
> > +config GPIO_VISCONTI
> > +       tristate "Toshiba Visconti GPIO support"
> > +       depends on ARCH_VISCONTI || COMPILE_TEST
> > +       depends on OF_GPIO
> > +       select GPIOLIB_IRQCHIP
> > +       help
> > +         Say yes here to support GPIO on Tohisba Visconti.
> 
> Add:
> select GPIO_GENERIC

OK, I will add this.

> 
> Then all of these:
> 
> > +static int visconti_gpio_get(struct gpio_chip *chip, unsigned int offset)
> > +static void visconti_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
> > +static int visconti_gpio_get_dir(struct gpio_chip *chip, unsigned int offset)
> > +static int visconti_gpio_dir_in(struct gpio_chip *chip, unsigned int offset)
> > +static int visconti_gpio_dir_out(struct gpio_chip *chip, unsigned int offset, int value)
> 
> Can be implemented by the genric MMIO GPIO library.

I see. I will update using generic MMIO GPIO library.

> 
> > +       gpio_chip = &priv->gpio_chip;
> > +       gpio_chip->label = name;
> > +       gpio_chip->owner = THIS_MODULE;
> > +       gpio_chip->parent = dev;
> > +       gpio_chip->request = gpiochip_generic_request;
> > +       gpio_chip->free = gpiochip_generic_free;
> > +       gpio_chip->get = visconti_gpio_get;
> > +       gpio_chip->set = visconti_gpio_set;
> > +       gpio_chip->get_direction = visconti_gpio_get_dir;
> > +       gpio_chip->direction_input = visconti_gpio_dir_in;
> > +       gpio_chip->direction_output = visconti_gpio_dir_out;
> > +       gpio_chip->base = 0;
> > +       gpio_chip->ngpio = VISCONTI_GPIO_NR;
> > +       gpio_chip->irq.init_valid_mask = visconti_init_irq_valid_mask;
> 
> Initialized the generic helpers using the addresses of the
> GPIO registers here by a call to bgpio_init().
> 
> Check this driver for an example:
> drivers/gpio/gpio-ftgpio010.c
> 
> If you get uncertain about the arguments to bgpio_init()
> check drivers/gpio/gpio-mmio.c, there is kerneldoc for the
> function.
> 
> By doing this you get implementations of gpio_[get|set]_multiple()
> for free.


Thanks for your suggestion.
I see. I will check these and update.


> 
> Yours,
> Linus Walleij

Best regards,
  Nobuhiro